and to make room for the largest possible boiler

This is Kato 40-102 N Unitram R180mm-45º Right Curve Street Track

Here is a Lionel 6-36831 O Maintenance of Way Welding Car #36831

Trainz Product Id: 11464390

Model Number: 6162

MTH 30-79635 O Gauge U.S. Army Engineering Car #8766 ProductID_12043794 and to make room forThis is a MTH 30 79635 O U. S. Army Engineering Car #8766. Features: Intricately Detailed, Durable ABS Body, Stamped Metal Floors, Metal Wheels and Axles, Diecast 4 Wheel Trucks, Fast Angle Wheel Sets, Needle Point Axles, (2) Operating Diecast Metal Couplers, Detailed Brake Wheel, Sliding Car Doors, Operating Interior Lighting, Near Scale Proportions, Unit Measures: 11 1 2 x 2 1 2 x 4, Operates On O 27 Curves Condition: Factory New (C 9) Operational