railjoint

From rail +‎ joint.

railjoint (plural railjoints)

1. Alternative form of rail joint
   • 1960 March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, in Trains Illustrated, page 141:

     Apart from a vague rushing noise outside the windows and the very muffled beat of the wheels on railjoints, one might have been sitting in an intimate private lounge in a four-star hotel.