Task: Data-Imputation (source dataset: WebTable)

Please fill in the missing value in the input table. The missing value is denoted by '[MISSING]'. Please only return the value filled in. Do not return the whole table.

No explanation, return the value filled in JSON format: {"value": "filled_value"}. 

Input Table:
| Route Name                           | Originating Station               | Starting Milepost   | Terminating Station   |   Ending Milepost | Acquired from                                                               | Acquisition Date                                         | Total Miles                                                                                                                                                                           |
|:-------------------------------------|:----------------------------------|:--------------------|:----------------------|------------------:|:----------------------------------------------------------------------------|:---------------------------------------------------------|:--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Astoria Line ("A-Line")              | Gasco                             | 5.2                 | Astoria               |              99.7 | BNSF Railway                                                                | 1996                                                     | 94.5                                                                                                                                                                                  |
| Bailey District                      | Corvallis                         | 688.9               | Dawson                |             679.9 | Southern Pacific                                                            | 1993                                                     | 24.1 (includes 1.3 mile spur from Alpine Junction to Monroe)Now closed and track mostly removed except for about a 5-mile stretch south of Corvallis that was sold to a local farmer. |
| Dallas District                      | Gerlinger                         | 728.9               | Dallas                |             733.8 | Southern Pacific                                                            | 1993                                                     | 4.9                                                                                                                                                                                   |
| Forest Grove District ("OE Line")    | Hillsboro                         | 4.6                 | Forest Grove          |              10   | BNSF Railway                                                                | 1996                                                     | 5.4                                                                                                                                                                                   |
| Oregon Electric District ("OE Line") | Beaverton (TriMet BTC)            | [MISSING]           | Eugene                |             140.5 | BNSF Railway                                                                | 1996 (North of Quinaby), (South of Quinaby)              | 114.0                                                                                                                                                                                 |
| Tillamook District                   | Beaverton (Junction with OE Dist) | 755.4               | Banks                 |             774.7 | Southern Pacific                                                            | 1995                                                     | 22.3                                                                                                                                                                                  |
| Toledo District                      | Albany                            | 690.9               | Toledo                |             765.6 | Southern Pacific                                                            | 1993                                                     | 74.7                                                                                                                                                                                  |
| United Railways District             | United Junction                   | 10.0                | Banks                 |              27.5 | BNSF Railway                                                                | nan                                                      | 17.5                                                                                                                                                                                  |
| Westside District                    | Corvallis Junction                | 689.9               | Cook                  |             764   | Southern Pacific                                                            | 1993 (South of Springbrook), 1995 (North of Springbrook) | 74.1                                                                                                                                                                                  |
| Willamina District                   | Whiteson                          | 730.6               | Willamina             |             749.3 | Southern Pacific                                                            | 1993                                                     | 18.7 (does not include 5.2 mile spur to Fort Hill operated as-needed)                                                                                                                 |
| Willsburg District                   | Willsburg Junction                | 740.7               | Tigard Yard           |             750   | Southern Pacific                                                            | 1995                                                     | 11.0                                                                                                                                                                                  |
| Hampton Railway District             | Willamina                         | 0.0                 | Fort Hill             |               5.2 | (This line is now used for car storage only. The mill has been dismantled.) | nan                                                      | nan                                                                                                                                                                                   |



row_idx: 4
col_idx: 2
col_name: Starting Milepost
label: 27.5