We note that Pandrol Assembly 13401 is designed "for use on DEPOT ballasted track and DEPOT ACCESS tracks on concrete sleepers". In particular, we note the comment in the 'Technical Data for Individual Components of Assembly 13401' that the Cast iron shoulder (Pandrol part No. 7323 / 18375) is "Shoulder for depot track" and that the Rail Pad (Pandrol part No. 13403) is "Rail pad for depot sleeper". Please provide an Assembly that is designed for main line traffic (17 tonne axles at 160km/h and 20 tonne axles at 120km/h) and specify pads and shoulders accordingly