The TRIANG R50 Princess Cylinder Block Fots over Chassis X061 in maroon yellow with black lining is a vintage model railway collectable from the United Kingdom. This pre-built unit is made of plastic and is compatible with the R59 and R59s models. With a 1:76 scale and analogue control system, this cylinder block features a smoke unit and is suitable for collectors aged 17 years and up. The Tri-ang brand adds a classic touch to this OO gauge railway accessory, making it a valuable addition to any model railway collection.