Thinkpad E vs L vs T

[Whitieiii]

I know this has been said multiple times but when going with a newer Thinkpad (440 and newer) what makes the E, L, and T series different? what would make someone go for one or the other if price isn't a deciding factor? I know our school just got a whole new shipment of L550's (about 60 of them) for the 2 new mobile laptop carts before I graduated but and i'm thinking why would they use that model in that application?

[Thinkpad4by3]

The E series is like the old i-Series: meant for consumers, had really bad LCDs, but you could get a mid-range one if you spec'd it out right, but was modeled a but differently to look better for consumers.
The L series is like the old R-series: Looks like a T-series, Shaped like a T-series,usually inferior display and build materials, same processors and specs beside display but you can get decent displays for the L-series.
The T series is like the old T-series: It is a T-series. A brick of a machine built from metal and high strength plastic. Configure it however you please.