I was spoiled as a young railfan. Provo Yard in my hometown offered numerous opportunities to photograph interesting, older power from the likes of the Rio Grande, Utah Railway and Union Pacific. A beautiful five pack of Alco RSD-5s idle away the afternoon awaiting a call east on a coal empty to Carbon County. The exhaust sound of these classics sounded something like this: 'ditty-rump, ditty-rump, ditty-rump'. I loved these unique beasts and miss them.