Class 345 Pantographs

[EFielding32]

I’ve been searching forums for a while now, and haven’t found anything about EMUs running with both pantographs raised. I’m unsure whether there are any other units that do this (please enlighten if there are!) can anyone explain why class 345s tend to have both pans up?
Thanks

 

[John Webb]

The Class 700 trains run by Thameslink always have two pantographs in use on 8-car units and three pantographs on 12-car units.

 

[swt_passenger]

I’ve been searching forums for a while now, and haven’t found anything about EMUs running with both pantographs raised. I’m unsure whether there are any other units that do this (please enlighten if there are!) can anyone explain why class 345s tend to have both pans up?
Thanks

Welcome to the forum.

They are effectively two half trains with each half having a separate power system. So that provides increased redundancy - if one half train fails the other can “self rescue” the whole unit. Thameslink 700s also run with two pans up for the same reason.

A long EMU such as a 390 has a slightly different setup because it has a 25 kV bus line along the roof, this connects the single pantograph to a number of separate traction packages, 2 in a 9 car and 3 in an 11 car.

 

[43096]

The Class 700 trains run by Thameslink always have two pantographs in use on 8-car units and three pantographs on 12-car units.

12-car 700s have two pantographs. Like the 345s they are effectively two half sets, either of 4 or 6 cars.

 

[EFielding32]

Welcome to the forum.

They are effectively two half trains with each half having a separate power system. So that provides increased redundancy - if one half train fails the other can “self rescue” the whole unit. Thameslink 700s also run with two pans up for the same reason.

A long EMU such as a 390 has a slightly different setup because it has a 25 kV bus line along the roof, this connects the single pantograph to a number of separate traction packages, 2 in a 9 car and 3 in an 11 car.

Thanks for the clarification! Interestingly I was also using a pendolino for comparison, thank you for that

The Class 700 trains run by Thameslink always have two pantographs in use on 8-car units and three pantographs on 12-car units.

Same case as the 745s ?

 

[800001]

The Class 700 trains run by Thameslink always have two pantographs in use on 8-car units and three pantographs on 12-car units.

12 car 700s for Thameslink have 2 pantographs, not 3, and run with both operational.

 

[John Webb]

12 car 700s for Thameslink have 2 pantographs, not 3, and run with both operational.

I could have sworn the 12-car had three! next time I'm in the St Albans South box I'll have to look closely - we get a nice view of the train roofs passing by!

 

[800001]

I could have sworn the 12-car had three! next time I'm in the St Albans South box I'll have to look closely - we get a nice view of the train roofs passing by!

Attached below is a video from YouTube showing a 12 car.

 

[RunRepeat]

Thanks for the clarification! Interestingly I was also using a pendolino for comparison, thank you for that


Same case as the 745s ?

745s run with a single panto up, generally the rear.

 

[John Webb]

Attached below is a video from YouTube showing a 12 car.

Thanks for the clarification.