Simplify the following text for a Grade 14 native English-speaking person.
Original: After extensive retrofitting , the MTR system has become , in general , disabled-friendly â '' the trains have dedicated wheelchair space , the stations have special floor tiles to guide the blind safely on the platforms , and there are extra wide entry and exit gates for wheelchairs as well .
Simplified: After extensive retrofits , the MTR system has become , in general , disabled-friendly -- the trains have dedicated wheelchair space , the stations have special floor tiles to guide the blind safely on the platforms , and there are extra wide entry and exit gates for wheelchairs as well .