I've bought myself a new monopod. Monopods are a lot lighter and easier to carry about than a tripod but still provide a stable support for a video camera, and when filming at railway stations they don't attract the attention of the platform staff who tend to complain about tripods causing an obstruction.
Personally, I think that suitcases, cycles and pushchairs are a bigger obstruction, but the platform staff don't see them like that.