Can the FCC 377 be used on DC and AC? And if so can i change between DC and AC on the fly or is it a sperate consist https://store.steampowered.com/app/222541/Train_Simulator_First_Capital_Connect_Class_377_EMU_AddOn/
It can certainly operate on both DC and AC - see controls on pp8-9 of the manual for pantograph and shoe movements. https://cdn.cloudflare.steamstatic.com/steam/apps/222541/manuals/Class 377 EMU FCC.pdf?t=1447357089 I'd presume you could change power en route - but only one way to find out!
In the context of TS any Electric train can be used on any voltage third rail, fourth rail or OHLE, TS has only one pre-requisite, is the track ticked as electric or not, of course what's right on what track from a realism perspective I'll leave for others to tell you as I'm certainly not knowledgeable enough for that.
