A ProductType relates to how a means of transport "works" in local context.
Example: Even though S-Bahn and U-Bahn in Berlin are both trains, they have different operators, service patterns,
stations and look different. Therefore, they are two distinct products subway and suburban.
A ProductType relates to how a means of transport "works" in local context. Example: Even though S-Bahn and U-Bahn in Berlin are both trains, they have different operators, service patterns, stations and look different. Therefore, they are two distinct products subway and suburban.