The smallest diesels that RENFE had were its class 10100 diesel shunters (later renumbered to class 301).
Although the original plan was for 100 locos, in the end 46 of these 130hp machines were built between 1961 and 1963, in three batches – 10101 to 10113 by Euskalduna, 10114 to 10126 by Macosa, and 10127 to 10146 by MTM (Maquinista Terrestre y Maritima). They gained the nickname “pegasins”, due to their Pegaso engines.
The class are all now out of service, but nearly half survive.
Survivors
| 1st number | 2nd number | Location | Notes |
| 10101 | 301 001 | ASVAFER, Valladolid | |
| 10103 | 301 003 | Estación Cabra | |
| 10104 | 301 004 | AVENFER, V. de Baños | |
| 10106 | 301 006 | Museo del Ferrocarril de Madrid | |
| 10108 | 301 008 | APPFI, Mora la Nova | |
| 10109 | 301 009 | plinthed in Getafe | Google Maps |
| 10110 | 301 010 | on a farm in Valdelaguna | |
| 10112 | 301 012 | Museo de la Ferrocarril de Catalunya, Vilanova | |
| 10114 | 301 014 | Valladolid Argales | |
| 10115 | 301 015 | Salamanca? | |
| 10119 | 301 019 | AVENFER, V. de Baños | |
| 10120 | 301 020 | Asociacion Amigos Ferrocaril, Alcazar de San Juan | |
| 10122 | 301 022 | plinthed in Urnieta | |
| 10123 | 301 023 | ASAFAL, Almería | awaiting restoration |
| 10126 | 301 026 | plinthed in Almoines | Google Maps |
| 10130 | 301 030 | Museo de la Ferrocarril de Catalunya, Vilanova | |
| 10144 | 301 044 | last known to be at the premises of Desguaces Montero, Salamanca | scrapped? |
| 10145 | 301 045 | Ourense Works | |
| 10146 | 301 046 | Cementos Tudela Veguin cement works, La Robla | in industrial use |
European Traction 