Forty similar pieces with varying numbers of connecting pins stuck in them, you will probably need a few more of those. Light corrosion, should largely come off most of them with a spray or emery cloth. We are however selling these "As-Is" largely due to the fact that we are unsure of the gauge. I measure the centers of the rails as 11/16" apart and I will be happy to take other measurements requested but do not ask me to guess the name of the gauge because if you cannot tell from the measurements please don't think I would be able to. If you lay a straight ruler flat across them, from end to end on the inside rail is nine inches, on the top rail it is ten inches. Pieces are solid not breaking or anything so we don't see reason why they will not transmit the necessary electric charge to run the train but you may have to work with them some and once more we remind interested parties that these are sold "as-is". These have probably been in an attic a long time. Forty pieces and these are all we have, if there were straight or crossover pieces with this set we did not get them. Will ship by most advantageous method, choice will depend on distance to ship, or you can come pick them up in person no extra charge that way.