user
Instruction
Answer the question based on the provided table.


Table
Table Title: Churnet Valley Railway
Table Content:
| Number | Name | Type | Livery | Status | Notes |
| --- | --- | --- | --- | --- | --- |
|  | Brightside | Yorkshire Engine Company 0-4-0 | Black | Under Repair | Currently dismantled for overhaul |
| 6 | Roger H. Bennett | Yorkshire Engine Company "Janus" 0-6-0 | NCB Blue | Operational | ~ |
| D2334 |  | Class 04 | Green | Under Repair | Stopped at Sep 2012 diesel gala after failure |
| 25322 | Tamworth Castle | Class 25 | "Ice Cream Van" Blue | Static Display | built in 1967. Cosmetically restored in 2008 |
| 33021 | Captain Charles | Class 33 | Blue | Operational | built in 1960. On loan from Tysley |
| 33102 | Sophie (Unofficial) | Class 33 | Blue | Operational | built in 1960. Launched Sep 2012 - restoration still being completed although the loco is now in service |
| 37407 |  | Class 37 | Transrail Grey | Stored | ~ |
| 37424 |  | Class 37 | Transrail Grey | Stored | ~ |
| 47524 |  | Class 47 | Rail Express Systems | Under restoration | ~ |


Question
how many locomotives are currently operational?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["3"]