Cowford wrote:Excellent - thanks for all the quick responses. Any further info anyone digs up is, again, really appreciated. Half the battle of dealing with the AAR and FRA in the US is understanding the organization and knowing the folks... they are typically very cooperative.
Here is the Commission page about interoperability - the harmonisation of rail standards throughout the EU.
http://ec.europa.eu/transport/rail/index_en.html
Linked to it is all the information you might want.
Of course rail is a much bigger industry in Europe than in the US and is therefore worth a great deal of attention from the Commission.
Included in harmonisation are:
loading gauges (Britain's is smaller)
power supplies (many different voltages)
signal systems (ERTMS)
customs checks at frontiers
multi-voltage locos and EMUS
couplings
etc.