Rail Ownership (0)
| Port of Houston Authority (PHA) |
| Union Pacific (UP) |
| PTRA and Union Pacific (UP) |
| Not Available |
Rail Operation (1)
| PTRA |
|
| PTRA and Union Pacific (UP) |
| PHA | UP | BNSF |
|
| Union Pacific (UP) |
| UP | BNSF |
|
| PTRA | UP | BNSF |
|
| Not Available |
Rail Maintenance (2)
|
| PTRA |
|
| Port of Houston Authority (PHA) |
|
| Union Pacific (UP) |
|
| Not Available |
|