You can try adding this to your config. Unfortunately all of the speaker objects are one big mesh so it will turn the lights on for every single speaker object around the track. There's no way to prevent that. Make sure you paste this over the existing LIGHT_SERIES_0 and MATERIAL_ADJUSTMENT_0 entry.
[LIGHT_SERIES_0]
ACTIVE=1
DESCRIPTION=Tracklights
VISIBILITY_LEVEL=0
MESHES=lighton_NIGHT
CONDITION=NIGHT_SMOOTH
OFFSET=0,0,0
DIRECTION=NORMAL
DIRECTION_OFFSET=0, -1, 0
SPOT=135
SPOT_SHARPNESS=0.5
RANGE=90
RANGE_GRADIENT_OFFSET=0.2
FADE_AT=900
FADE_SMOOTH=300
CLUSTER_THRESHOLD=15
DIFFUSE_CONCENTRATION=0.88
COLOR=255, 220, 150, 0.075
[LIGHT_SERIES_...]
ACTIVE=1
DESCRIPTION=Tracklights
VISIBILITY_LEVEL=0
MESHES=ldspkr?
CONDITION=NIGHT_SMOOTH
OFFSET=0,0,0
DIRECTION=NORMAL
DIRECTION_OFFSET=0, -1, 0
SPOT=135
SPOT_SHARPNESS=0.5
RANGE=80
RANGE_GRADIENT_OFFSET=0.2
FADE_AT=900
FADE_SMOOTH=300
CLUSTER_THRESHOLD=15
DIFFUSE_CONCENTRATION=0.88
COLOR=255, 220, 150, 0.025
[MATERIAL_ADJUSTMENT_0]
ACTIVE=1
VISIBILITY_LEVEL=0
DESCRIPTION=spots ksemissive
MATERIALS=LIGHTSONNIGHT
KEY_0=ksEmissive
VALUE_0=255, 248, 232, 0.1
;VALUE_0=255, 245, 235, 1
VALUE_0_OFF=0, 0, 0
KEY_1=ksAlphaRef
VALUE_1=-193
VALUE_1_OFF=0, 0, 0
CONDITION=NIGHT_SHARP
RANGE = 25
[MATERIAL_ADJUSTMENT_...]
ACTIVE=1
VISIBILITY_LEVEL=0
DESCRIPTION=spots ksemissive
MATERIALS=LDSPKR
KEY_0=ksEmissive
VALUE_0=255, 220, 150, 0.01
;VALUE_0=255, 245, 235, 1
VALUE_0_OFF=0, 0, 0
KEY_1=ksAlphaRef
VALUE_1=-193
VALUE_1_OFF=0, 0, 0
CONDITION=NIGHT_SHARP