Craftmen not boarding train

[snorkellingfish]

I have a town and I have a train route heading to my iron facility (which has iron mines and a steel plant), but craftsmen don't seem to be boarding the trains to work in the steel plant.

Labourers are happily boarding the trains and working in the steel plant, so I know that the route can carry workers.

Craftsmen are happily boarding other trains leaving from the town's station, so I know that they can access the station - and they're complaining about not enough work, so there should be spare craftmen available.

I've tried saving and reloading, but it's not helping.

I'm perplexed, and would happily take tips on stuff I haven't tried, because I, like, need my iron plant to have workers to make tools to enhance production everywhere else.

[PointLuck]

If I'm not mistaken, not all carriages can carry craftmen. Make sure you choose the right one.

Edit: I'm totally wrong, sorry for that :) they can all carry all types of passengers.

[snorkellingfish]

I tried destroying and then rebuilding the smelter, and craftsmen started rushing over, and then they just stopped and disappeared. I'm officially flummoxed.

[omega231]

Have you tried locking a particular car to craftsman only?

I encountered a similar problem when transporting stone and sand from quarries. The train would only ever load stone and never sand. After locking a car to sand specifically, it and only it would fill with sand.

I can only guess that certain materials and personnel get priority in selection by trains for transport.