Rio Grande 4001, a diesel-hydraulic built by Germany’s Krauss-Maffei, fills the window of a caboose cupola on Oct. 11, 1963. The exotic unit was testing in helper service between Denver and the Moffat Tunnel.
R. P. Parsons photo
Krauss-Maffei close-up
By Angela Cotey | January 6, 2023
| Last updated on August 7, 2025
