Giruno

ShowMeTheJourney has anticipated what questions are most often asked about travelling on these trains used for most of the express services which take the Gotthard route, which passes through Bellinzona and Lugano.

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Also this is link to The information on the SBB website about travelling by these 'Giruno' trains.

These trains have a theoretical top speed of 250 km/h (155 mph).
However, the fastest sections of the routes that they typically take have a maximum speed of 200 km/h (125 mph), and these occur when the trains travel;

• through the Gotthard Base Tunnel, in which the railway has a maximum speed of 200 km/h (125 mph),
• on the higher speed line between Olten and Bern
  Most of the routes that they follow have a top speed of 160 km/h (100 mph),

Seat reservations are automatically assigned when making international journeys and journeys within Italy, but not for journeys solely within Switzerland - see the Swiss ticket guide

Yes, when booking tickets on the Trenitalia website for journeys between Italy and Switzerland.
However, when booking on the SBB website, it's only a possible to choose a preference for a type of seat - but the selections don't include, window or aisle, forwards or backwards.

This isn't possible, partially because when these trains are used on routes which call at Bern, Luzern or Milano Centrale, they will reverse direction on departure.

Seat reservations are mandatory when travelling with rail passes on international journeys and on journeys solely within Italy
See the guide to making rail pass reservations to discover more info on the multiple booking options.
Note that there is no need to make reservations when taking these trains on journeys solely within Switzerland.

These trains have a restaurant car which can be accessed by all passengers.
Though when travelling in First Class, the full menu is available as an at-seat service - Though when two trains are joined together for part of the journey in Switzerland, the At Seat Catering may only be available in the train that will be travelling on to Milano.
The restaurant car has a counter which also offers a take-away service.

At every seat for both standard E.U. 2-point plugs and Swiss plugs.

Yes these trains have both WLAN connectivity and enhanced access to the roaming Wi-fi available on Swiss mobile networks.

Only for travel in First Class.

There are no luggage rules for travel by these trains, though an option for transporting larger items of luggage between Swiss locations, is to use the Station-To-Station luggage service.

Yes there are total of eight wheelchair spaces available in coaches equipped with accessible toilets - four spaces in 1st class and four spaces in 2nd class.
The SBB guide to reduced mobility travel.

There are bike racks located in two of the Standard Class coaches, places must be reserved pre-boarding.

Yes, but tickets or passes are required for larger dogs,
Yu can transport small dogs with a wither height of up to 30cm for free as hand luggage provided they are in a transport box, basket or other animal-friendly container and placed under your seat. However, once the dog is no longer in its container, you will require a separate ticket for the dog.
Dog tickets for international journeys need to be booked at stations prior to boarding.

The train service on the 'Gotthard route between Switzerland and Italy has been transformed in recent years, new infrastructure including the world's longest railway tunnel, has now been complimented by new trains.

On the services which depart from Zurich, two trains are typically joined together, with only the front train heading to Milano and the rear train terminating in Chiasso or Lugano.
Watch out for this because while the train is waiting in Zurich station, the on-board indicators can initially show that the entire train is heading to Milano.

These trains all have a restaurant car which is available from 6.30am to 9pm to both 1st and 2nd class ticket holders.
Though when traveling in 1st class the full menu is typically available as an at seat service, so there is no need for 1st class travellers to go to the restaurant car.

The menu is reasonably priced by Swiss standards,

The restaurant service tends to be popular, hence many 2nd class passengers head direct to the restaurant coach when boarding.
So if you want to be sure of a place in the car, the best option can be to go direct to the restaurant and then move to your reserved seat after your meal.
Note that the seat reservation service for places in the restaurant car, which SBB offers for travel by its IC trains, is not available on these international EC trains

A bar car selling hot, cold drinks, light meals and snacks is also available to all passengers.

When travelling to/From Italy:

Reservations are compulsory for cross border journeys between Italy and Switzerland, and for journeys solely within Italy.

When booking international journeys online or at stations, the reservation is included when booking a ticket and the ticket(s) you will be issued will be seat specific.

When travelling to/From Germany:

Seat reservations are optional on this route and the fees are €5.30 in 1st class and €4 in 2nd class.
Book a 1st class ticket on DB, the German national railways, booking service or at a station in Germany and the reservation is complimentary and included within the ticket price, but if you book online with SBB, Swiss national railways, the reservations won't automatically be included.

For journeys within Switzerland:

Reservations are NOT required for journeys solely within Switzerland by these trains – though they’re recommended, as these trains tend to be busier than non-international trains.
However, as reservations are optional when travelling between Swiss stations they're not automatically included when booking tickets online.

Using rail passes

If you will be travelling with a Eurail or InterRail pass valid in both Switzerland and Italy, you have to pay supplement/reservation fees prior to boarding these trains for cross border journeys.
If you will be travelling from Italy, the rail pass reservations can be booked at the ticket desks at major stations and you won't be charged a booking fee.
Though the Trenitalia ticket machines don't sell reservations for these trains.

In contrast if you book reservations in Switzerland - at a SBB Reisezentrum booking desk, you will have to pay a 11 CHF booking fee - in addition to the reservation fee.
SBB's online seat reservation service does NOT sell reservations for international journeys from Switzerland.
The reservations for direct journeys by these EC trains can booked, without paying any additional fees, on the website of Austria's national rail operator, OBB.
It's best not to question the logic of this and use the only option for booking rail pass reservations on these trains, without incurring any additional expense.
Though the steps to take on the OBB website aren't particularly obvious, hence this guide* to booking Eurail/InterRail reservations with OBB.

In contrast to the international journeys, rail pass users don't have to reserve when travelling by these trains on journeys wholly within Switzerland.
It can pay off to take a chance on finding a seat when making Swiss journeys, as the reservation fees are comparatively expensive.

These trains have bike racks for non-folding bicycles, but bike tickets must be purchased prior to boarding.
However, they can't be booked online for international journeys, so will need to be arranged at the station, but it's best to avoid leaving this to the last minute just before boarding.

Look out for the bike symbols on the train's exterior, you'll need to target these coaches when boarding.