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If you are not a bus-O, you may not know the difference between "highbridge" (normal-height), and "lowbridge" (low-height) double deckers. (The trade names "Lodekka" (Bristol), and "Loline" (Dennis) are also applied to lowbridge buses.) This picture shows three low-height buses between two normal-height buses, and you can see how low the centre buses are. The red beam-edge across the top shows that there are variations between lowbridge buses, too.

"Lo" buses are specially designed to pass beneath bridges that were built long before anyone had thought of building tall vehicles.There are different ways to make a bus lower than normal, and they can be combined: (a) instead of two seats each side of a central gangway, using 4-seater "sofas" on the left-hand side of the upper deck, and a sunken gangway on the right side (which means low headroom for the lower-deck passengers under it); (b) lower headroom on the lower deck generally; (c) "underslinging" the frame at the rear (running the frame under the rear axle); (d) using a hypoid (low-set), horizontal, or offset drive to the rear axle; (e) using a small crownwheel, and reducing the resulting high gear ratio by epicyclic gears in the hubs.
You will see code numbers dotted about, usually after the model's subheading. (For example, The Daimler utility operated by Douglas Corporation has the code number 43912 at the end of the subheading.) This is the model code number, and may be useful for searching the internet.