| GCat | Transportation Modes |
| MCat | Rail |
Intercity rail passenger systems. Railroad operating technologies. Freight transport. Railroad track system design. Railway maintenance and safety.
| GCat | Transportation Modes |
| MCat | Rail |
Courage changes things for the better . . . . [With courage you can] stay with something long enough to succeed at it, realizing that it usually takes two, three or four times as long to succeed as you thought or hoped.

I wish I had an answer to that because I'm tired of answering that question.