The cylinder banks are at 60 deg. with the cylinders staggered to allow for side-by-side connecting rods on each crank.1958 April 23, “British Railways First Main-Line Diesel-Hydraulic Locomotive”, in Railway Magazine, page 265:
A “moving platform” scheme[…]is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays.2013 June 1, “Ideas coming down the track”, in The Economist, volume 407, number 8838, page 13 (Technology Quarterly):
side-by-side
noun
Etymology From side + by + side.
1
A type of multipurpose off-highway utility vehicle, with four wheels, resembling a golf cart.
2
Abbreviation, Ellipsis Ellipsis of side-by-side shotgun.
3
Abbreviation, Ellipsis Ellipsis of side-by-side rifle.
Literally Beside or alongside one another; close to one another and abreast.
The new houses were built side by side, facing the lake.
The structure was examined and passed by the Board of Trade in February, 1890, after it had been tested with two trains of 50 loaded wagons, each hauled by two engines, and pushed by a third. The trains ran side by side, and their combined weight, including the six engines, was 1,800 tons. The deflections of the girders were precisely in accordance with the calculations of the engineers.1950 March, H. A. Vallance, “On Foot Across the Forth Bridge”, in Railway Magazine, page 148:
1 more example
Two lamps mounted side by side about two feet apart will flash alternately and when this happens traffic must stop; disobedience of these signs becomes an offence.1960 September, “Talking of Trains: New level-crossing signs”, in Trains Illustrated, page 519: