Lobe-dominated radio-loud ( LD RL ) quasars occupy a restricted domain in the 4D Eigenvector 1 ( 4DE1 ) parameter space which implies restricted geometry/physics/kinematics for this subclass compared to the radio-quiet ( RQ ) majority of quasars .
We discuss how this restricted domain for the LD RL parent population supports the notion for a RQ-RL dichotomy among Type 1 sources .
3C 57 is an atypical RL quasar that shows both uncertain radio morphology and falls in a region of 4DE1 space where RL quasars are rare .

We present new radio flux and optical spectroscopic measures designed to verify its atypical optical/UV spectroscopic behaviour and clarify its radio structure .
The former data confirms that 3C 57 falls off the 4DE1 quasar “ main sequence ” with both extreme optical Fe ii emission ( R _ { FeII } \sim 1 ) and a large Civ \lambda 1549 profile blueshift ( \sim -1500 km s ^ { -1 } ) .
These parameter values are typical of extreme Population A sources which are almost always RQ .
New radio measures show no evidence for flux change over a 50+ year timescale consistent with compact steep-spectrum ( CSS or young LD ) over core-dominated morphology .
In the 4DE1 context where LD RL are usually low L/L _ { Edd } quasars we suggest that 3C 57 is an evolved RL quasar ( i.e .
large Black Hole mass ) undergoing a major accretion event leading to a rejuvenation reflected by strong Fe ii emission , perhaps indicating significant heavy metal enrichment , high bolometric luminosity for a low redshift source and resultant unusually high Eddington ratio giving rise to the atypical Civ \lambda 1549 .