This fully-sprung tender chassis using the Continuous Springy Beam (CSB) principle is buildable in both EM and P4 gauges. The suspension system is an integral part of the overall design, thus eliminating any need for complicated measuring, marking-out and drilling - simply fit the components that come with the kit and the job’s done
 
It's primarily aimed at the Bachmann Ivatt Mickey Mouse 2MT and 4MT Mucky Duck locomotive tenders but, with a small amount of work, most makes and models of the same prototype, design and wheelbase would be suitable, providing the underside to the tender is flat and has no obstructions.
 
Details, such as water pick-up gear and linkage, brake cross-shaft, pull rods and levers and frame stretchers, are all included, along with separate guard irons for glueing onto Bachmann models.