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:
| Departure | Going to | Calling at | Arrival | Operator |
| --- | --- | --- | --- | --- |
| 03.54 | Peterborough East | Peterborough East | 04.05 | LNWR |
| 08.29 | Peterborough North | Castor, Overton, Peterborough North | 08.48 | GNR |
| 08.40 | Peterborough East | Castor, Overton, Peterborough East | 09.04 | LNWR |
| 10.19 | Peterborough East | Castor, Peterborough East | 10.37 | LNWR |
| 10.50 | Peterborough East | Overton, Peterborough East | 11.05 | LNWR |
| 11.47 | Peterborough North | Castor, Overton, Peterborough North | 12.06 | GNR |
| 12.28 | Peterborough East | Peterborough East | 12.40 | LNWR |
| 13.52 | Peterborough East | Castor, Overton, Peterborough East | 14.12 | LNWR |
| 14.49 | Peterborough East | Overton, Peterborough East | 15.05 | LNWR |
| 16.16 | Peterborough East | Castor, Overton, Peterborough East | 16.33 | LNWR |
| 17.30 | Peterborough North | Castor, Peterborough North | 17.46 | GNR |
| 19.37 | Peterborough East | Castor, Overton, Peterborough East | 19.58 | LNWR |
| 22.01 | Peterborough East | Peterborough East | 22.15 | LNWR |
Question:
How many trains call at Castor, Overton, Peterborough East and are operated by LNWR?
Answer:
4.0