This weekend in Twello a little town in the Netherlands a brand new railroad crossing was realized.
there is a little film on youtube in which you do see the what kind of work has to be done to realize a crossing, even for pedestrians, bikers and farmingvehicles.
there is some footage on termic welds,
and some stuff regarding minus component [ in the Netherlands traction is realized bij 1500V DC where the minus is the track]
search for hartelaar voorst AHOB
or follow the next link
http://www.youtube.com/watch?v=B47W1qvDpRY
ENJOY