The Lionel Corp. 1015 Train Track Transformer is a 45‑Watt AC power supply designed for post‑war model railroads, providing an 8–15 V secondary with a built‑in speed throttle lever. Common failures include winding insulation breakdown or core overheating that can cause open circuits on the secondary, a stuck or non‑responsive throttle lever due to internal plastic deformation, and capacitor degradation leading to voltage ripple or loss of regulation. First‑check diagnostics: verify 120 VAC input is present and within tolerance; measure the secondary output while varying the throttle to confirm proper voltage swing; visually inspect for burn marks, corrosion on contacts, or physical damage to the lever mechanism.[oss-gpt-20b]