I have a class 73 Hornby & also found it was lacking in pulling power - just 3 coaches on the flat.
Increased weight in & around the motor bogie & in the middle by another 70grams ( 2.5 oz) & now it takes 5 coaches up a 1:60 gradient with no hesitation.
Rubber tyres are not on my list of improvements.
Increased weight in & around the motor bogie & in the middle by another 70grams ( 2.5 oz) & now it takes 5 coaches up a 1:60 gradient with no hesitation.
Rubber tyres are not on my list of improvements.