Settings to try

r_enablePostProcess "0"
r_vertexlight "1"
r_picmip "3"
r_subdivisions "80"
r_mapOverBrightBits "1"
r_overBrightBits "1"
r_intensity "1.1"
r_gamma ".8"
r_contrast "1"
r_lightmap "0"
r_dynamiclight "0"
r_flares "0"
r_fullbright "0"
r_drawSun "0"
r_fastsky "1"
r_lodbias "-2"
r_texturemode "GL_LINEAR_MIPMAP_LINEAR"

Quake live rail settings


color1 (default 2, values 1 to 7) represents the color of the beam.
color2 (default 7, values 1 to 7) represents the color of the effect (swirl or discs).
r_railcorewidth (default 6) represents the thickness of the beam in a rail. Applies to old (1) and new (0) style.
r_railwidth (default 16) represents the size of the discs when cg_railstyle is set to 1.
r_railsegmentlength (default 32) represents the length of the parts between discs when cg_railstyle is set to 1.

Bloom stuff to work with

seta r_BloomBlurRadius "1"
seta r_BloomPasses "1"
seta r_BloomSceneSaturation "0"
seta r_BloomSceneIntensity "0.8"
seta r_BloomSaturation "1.25"
seta r_BloomIntensity "1.2"
seta r_BloomBrightThreshold "0.3"
seta r_BloomBlurScale "1"
seta r_BloomBlurFalloff "0.75"
seta r_enableBloom "1"
seta r_bloomActive "1"