Everything? The GTO VVVF inverter for the Keikyu N1000 & N2100
series are made from Siemens AG.
This is due to the Japanese using one method of production,
which usage partly led to Japan's rise, called JIT (just in time)
production, which includes out-sourcing and specialization.
The Kawasaki R142As/R143s in New York are using
AdTranz/Bombardier Mitrac propulsion. while their newest R160Bs are
using Alstom ONIX (with some using Siemens IGBT-VVVF).