I have a postwar Lionel 2035 with air whistle tender 6466W . The loco runs fine (already at low voltage) but when I press the whistle button the whistle motor runs too slow for producing sound (even at full throttle) . When I place only the tender on track the whistle blows fine with no problem. The transformer is a K-Line K-951 0-20V, 40VA with whistle button. What could be the problem ?
Thanks for help, Klaus from Germany