I was wondering, when looking at the record breaking Mallard steam engine, if it could have beaten its own 126 MPH record with a more aerodynamic skin made of, say, alumninium.
Whilst pondering this it became evident that even our so-called high-speed trains have an enormous amount of high-drag undercarriage on show.
Today’s invention is an additional underskirt for railway carriages which would greatly smooth the airflow underneath the carriage and around its wheels by wrapping them in a lightweight tub.
This tub would ride on its own set of wheels (yellow), and have a gap at one end into which carriages could fit. This would allow rapid attachment and detachment for maintenance or to deploy them on the trains most in need of a speed increase.