RT-N-313-351-DCC Class 313121 Network Rail Yellow 3 Car Set (DCC Sound)Expected Delivery Q2 2026 (Subject to Change at the Manufacturer's Discretion). 313121 was painted into Network Rail yellow as part of NRs test fleet. Exclusive to Rails Model features: highly detailed 3 car electric multiple unit working, directional lights (with different appropriate styles for each version original or revised) user switchable lighting functions low profile drive unit (in centre car) kinematic close coupling with electrical