No, a diesel engine will not burn LPG. It would destroy a diesel engine. A gasoline engine can, with some modifications, burn LPG.
buses
Well this all depends on what type of engines are supplied in these buses. Usually buses use diesel due to the high weight load that that are put on the engines. Diesel engines have better compression and can usually provide more torque to do work with all those people on board. Here is a good read on Diesel engines....(link)
Diesel gas is used as fuel in vehicles and machinery that have diesel engines. Diesel engines are commonly found in trucks, buses, tractors, and construction equipment. Diesel gas is preferred for its efficiency and power in heavy-duty applications.
Buses, like many large vehicles, burn diesel fuel. Deisel-burning engines are better suited for large vehicles than gasoline-burning engines.
Internal combustion engines use diesel fuel. These can be situated in cars, trucks, buses and any other forms of transportation. They can also be used in engines for lawn mowers and other electrical equipment.
There are hybrid buses being manufactured and used. They are diesel electric hybrids and although they do not completely eliminate emissions they do lower the emissions produced by such engines.
Diesel engines are used primarily in large trucks and buses, in high-powered farm tractors, and in heavy construction machinery. Other markets include marine vessels and lawn-and-garden equipment.
Really depends on the type. A Type A school bus might have a gas, diesel, or CNG engine.. those will use whatever is standard for the chassis manufacturer (e.g., Triton gas or Powerstroke diesel for Ford chassis, Vortec gas or Duramax diesel for General Motors chassis, Hemi gas or Cummins diesel for Dodge chassis). For Type B, C, and D buses, Thomas Built buses is owned by Daimler A.G. - the parent company of Freightliner, Western Star, and Mercedes Benz, and have been available with Cummins, Mercedes-Benz, or Caterpillar (until 2009) diesel engines or Cummins CNG engines. IC Bus is a subsidiary of Navistar International, and can have Navistar MaxxForce or Cummins diesel engines, or Cummins CNG engines. Blue Bird does not make their own engines, so they will use Cummins diesel or CNG engines. In the case of diesels, 6 - 7 liters is most likely what you'll find, though I have, in the past, seen school buses with 7.3 liter 3126 and C7 Caterpillars.
A diesel mechanic performs preventative maintenance and repairs on diesel engines and vehicles. He or she might specialize by working with large trucks and buses, passenger vehicles, or heavy machinery such as bulldozers, cranes, and tractors. Diesel mechanics are valued for their expert knowledge of brake systems, transmissions, and electronic components unique to diesel powered vehicles.
Diesel
They run on Diesel
Most London buses are powered by an internal combustion engine fueled by diesel.