Yep, it shows the flavor of the aero industrial design of the age:
Number 4468 Mallard is a LNER Class A4 4-6-2 Pacific steam locomotive
built in the 1930s and designed by Gresley. A wind-tunnel tested,
aerodynamic body allowed it to reach speeds of over 100mph.
And a dash of:
"Big wheels keep on turnin'... "