Which kind of vehicle is blue?
The vehicle is a locomotive.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    5
2     0  to the right of   11
3     0  to the right of    6
4     0  to the right of    1
5     0  to the right of    2
6     0  to the right of    3
7     1  to the right of    6
8     1   to the left of    9
9     1  to the right of    4
10    1  to the right of    2
11    1   to the left of    0
12    1  to the right of    5
13    2  to the right of    6
14    2   to the left of    9
15    2  to the right of    4
16    2   to the left of    1
17    2   to the left of    0
18    2  to the right of    5
19    3   to the left of    7
20    3   to the left of    0
21    3   to the left of    9
22    4   to the left of    6
23    4   to the left of    0
24    4   to the left of    1
25    4   to the left of    5
26    4   to the left of    2
27    5   to the left of    1
28    5   to the left of    2
29    5  to the right of    4
30    5   to the left of    0
31    5   to the left of    6
32    6  to the right of    5
33    6   to the left of    0
34    6   to the left of    2
35    6  to the right of    4
36    6   to the left of    1
37    7  to the right of    3
38    7  to the right of   11
39    8               in   10
40    8  to the right of   12
41    9  to the right of    3
42    9  to the right of    2
43    9  to the right of    1
44    9  to the right of   11
45   11   to the left of    7
46   11   to the left of    0
47   11   to the left of    9
48   12   to the left of    8
49   14               in   13