I remember enjoying playing with my brother’s toy trains as much as he did. As an adult, I still like trains. However, because I don’t have any children to give me the excuse of owning toy trains, I play Sid Meier’s Railroads.
Sometimes I play it as just a train table, trying to meet all the goals. Other times I play vs. computer generated opponents. (I don’t do the multi-player.) Either way, its usually a good way to spend an hour or two.
I tried some mods, but with the exception of the official Holiday scenario, they weren’t well programmed.