Compatibility: 1/87 HO model train test track module designed to work with roller test stands. Compatible with 1/87 HO scale model trains from most brands Function: Test track bearing (roller trolleys) allows testing of model trains on tracks or layout setups Diagnostic Module: Single unit treadmill track for testing or repairing 1:87 HO scale trains. Helps analyze idling performance and movement to identify faults (train not included) Expandable: Multiple units can be connected for expanded diagnostic configurations. Reliable base ensures structural stability for use in exhibitions or repair work Including: 1 diagnostic treadmill unit Specification: Material: metal and plastic Size: 5.12 cm / 2.02 inches Package Includes: 1 x 1/87 HO model train test track module Note: Slight variations of 1–2 cm (0.39–0.79 inches) may occur due to manual measurement