Originally Posted by scycheng

Note that rules are often subjected to the interpretation of the conductor. In France, on the local trains, tandems and bike trailers are not allowed (sign is actually posted in the bike carriage section) but in all the times we took the local trains, it was only a problem once with a young conductor. I disconnect the front couplers so it's no longer a tandem but bike part which satisfied her desire to stick to the rules.