tren italia brand's their services around different music genres such as rock, pop orjazz.y've decided to brand these such trains as blues. diesel trains are still necessary and are likely to be for some time because of the wide variation in the amount of electrified lines, particularly across europe. so train manufacturers and railway operators across the world are looking at greener and more efficient ways to power their trains when external electric power isn't available. however, these trains will still rely on diesel power for large parts of some routes. the batteries only have a range of 15 kilometres at present, though they can be recharged while the train is in operation, both in diesel and electric mode. when it's near a station, the batteries power the train completely cutting emissions and reducing noise. at other times they will use overhead power or when the line is electrified, the diesel engine. however, the batteries will still be able to power other aspects of the train than just propulsion, such as lighting and heating. so what are some of the challenges w