I doesn't take outside experts to run short fast trains. We know how to do it, but the economics don't work. More short trains gets very expensive fast. Not only crew and locomotive expense. Line capacity costs are a deal breaker in this case. The entire American railroad network is designed for long trains with blocks of cars between classification points running daily or twice a day, except if you are the UP which runs a three track freight railroad.
European networks are designed for the kind of service they run.
The UPS, FedEx and USPS networks are designed around moving containers/trucks between major sorting centers. None of those centers have rail sidings, and most are not near a railroad. Many of those boxes between centers have their long haul by rail, and there are many daily trains dedicated to UPS. For example, CSX has a daily UPS train between Worcester and Chicago. UPS truck haul containers to Worcester from many sorting centers in the Boston area and other points on the east coast from Rhode Island to Maine. That is a very efficient system.
Amazon isn't worth mentioning in this context. They have an ad hoc system cobbled together with a huge number of subcontractors. You can always get overnight delivery if you throw enough money at it.
