Here's an odd piece of railroad history. 
What is it?  The Answer.

Take a test for fun

 Challenge 1 | Challenge 2 | Challenge 3 | Challenge 4 | Challenge 5 | Challenge 6 |  Trivia Rules | Write your own question

Thanks to the many folks that suggested questions for our quiz. 
I couldn't use all of them this time.  I saved many questions for future Challenges.