It features wood construction

The Trainz SKU for this item is P11422377

They are straight centerset shank couplers with standard gear boxes

The Trainz SKU for this item is P12456375

This is a MTH 30-205883 O Scale Union Pacific SW-9 Switcher Diesel Engine Calf (Non-Powered) #1874B

Atlas 10003114 HO Canadian National Dash 8-40CW Diesel Locomotive #2458 ProductID_12270172 It features wood constructionThis is an Atlas 10003114 HO Scale Canadian National Dash 8 40CW Diesel Locomotive #2458. It Features: Ditch lights (8 40CW only), Number boards, sand fill hatch, and marker lights where appropriate by railroad (8 40CW only), Realistic diecast underframe, Factory equipped with AccuMate knuckle couplers, Coupler pocket designed to accept AccuMate Proto couplers, Highly detailed coupler cut bars, Multiple unit hoses and trainline hoses, Five pole skewed