i wrote a long story but this stupid slow forum lost it when the connection timed out
anyways, Locomotief is now a sub brand of Gazelle and are both situated in the place called Dieren near the city of Arnhem. In the 50s, famous Dutch rider Kees Pellenaars had a team sponsored by Locomotief and they also did ride the TdF.
After 1968 i belief Gazelle branded all the bikes with their name.
There are a lot of Dutch sites with texts about it. If you need some translation just ask.