This is one of the places my boys always look forward to. It is an old railway from the building of the Hoover Dam that has been converted into a historical train museum. There are various examples of choo-choo's here dating back from the early steam engines up to the giant diesels. You can explore an old mail coach and view an extensive model train exhibit in one of the air conditioned coaches. There is a small yellow passenger train ride, which is free, that takes you through the "bone yard" where other unfinished train restoration projects lie wait for future funding.
The main feature here is on weekends they have a fully functional train that takes 2 40 minute rides down the tracks. It has overhead covered coaches where you can feel the wind and there are air conditioned enclosed coaches with restroom facilities also. It takes you through boulder city on down towards the tip of the hill where you can almost see Las Vegas and then back. TIckets to ride this train are 10$ for adults and 5$ for kids.
We always have to tell our 3 y/o that Thomas is sleeping in the train repair station because he works all week long, lol. The kids enjoy this much more than we could've ever expected. So we are now annual members of the "Friends of the Nevada Southern Railway" with a years worth of train rides for the whole family, yay! No matter what - our kids hit us up for a toy train in the gift store. I step & trip on numerous trains of every color in our house now.
It's a fun place you'll like it!