Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Class | Wheels | Date | No. built | Loco Nos. | Comments |
| --- | --- | --- | --- | --- | --- |
| D3 | 0-4-4T | 1892-6 | 36.0 | 363-398 | 396 and 397 rebuilt as Class D3X in 1909 |
| C2 | 0-6-0 | 1893-1902 | 55.0 | 433-452, 521-555 | 42 rebuilt as Class C2X 1908-40 |
| B2 | 4-4-0 | 1895-8 | 24.0 | 171, 201-212, 314-324 | all rebuilt as Class B2X 1907-10 |
| B3 | 4-4-0 | 1898 | 1.0 | 213 | all rebuilt as Class B2X 1907-10 |
| B4 | 4-4-0 | 1899-1902 | 33.0 | 42-74 | 12 rebuilt as Class B4X 1922-4 |
| E3 | 0-6-2T | 1894-5 | 16.0 | 165-170, 453-462 | Similar to No. 158 |
| E4 | 0-6-2T | 1897-1903 | 75.0 | 463-520, 556-566, 577-582 | 4 rebuilt as Class E4X 1909-11 |
| E5 | 0-6-2T | 1902-4 | 30.0 | 399-406, 567-576, 583-594 | 4 rebuilt as Class E5X in 1911 |
| E6 | 0-6-2T | 1904-5 | 12.0 | 407-418 | 2 rebuilt as class E6X in 1911 |
Question:
Which class at 55 built?
Answer:
C2