>>2016751It's also because of PSR.
RRs have been removing a lot of rolling stock from circulation as a result of the efficiency/cost-cutting measures.
>>2016752>Because the rest of the world doesn't have as strict of emission standards and has no need to purchase tier 4s.True, the countries that have comparable requirements to tier 4 controls are also more likely to have electrified networks.
Could've been possible in the USA but the end of the oil crisis stopped that from happening
