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SS Followup Car Precise Dimensions

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Good Day All.... Can someone, Please, provide the Secret Service "Cadillac"

followup car dimensions and/or its scaled diagram?

The following professionally surveyed map is why I am asking for the SS car

details (on the map the SS car is colored gray.... this is not a finalized

professional survey, yet)....



In this preliminary work, 3 of 5 theorized rear trajectories pass directly

over the SS car.

Interestingly (revealing to the point of debunking?) the warrenatti

theorized "lone nut" "snipers lair" trajectory passes directly over,

possibly directly into, where, very well, could have been two SS

agents (each headtop approximately 7' above the Elm Street pavement) on

its theorized trajectory to the approximately 3.5' to 4.5' President KENNEDY

theorized rear head impact.... hmmmmmmmm.... think about that....

From his cartoons that I have seen (but not purchased), I am starting

to understand Myers (deliberate?) choice to not include the SS

car/standing SS agents....

Don Roberdeau

U.S.S. John F. Kennedy, CV-67, "Big John" Plank Walker

Sooner, or later, the Truth emerges Clearly





T ogether

E veryone

A chieves

M ore



"I turned around to find out what happened when two additional shots rang out

and the President slumped into Mrs. Kennedy's lap and Governor Connally fell

to Mrs. Connally's lap."

(KELLERMAN did not start his FIRST turn rearward until Zf-253/254)

----ROY KELLERMAN, Secret Service agent in Presidential limousine, Original Treasury dept. report 11/29/63, & WCR 18H724

Edited by Don Roberdeau
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  • 1 month later...

Good Day All.... Can someone, Please, provide the Secret Service "Cadillac"

followup car dimensions and/or its scaled diagram?

I could have sworn I had a scaled diagram of the secret service follow up car. I will continue looking through my documents for you.

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Edited by John Dolva
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This link may be helpful:


The die-cast model, in 1:24 scale, is 11" long...which would approximate the length of the real "Queen Mary" as 22 feet long...

Here's some data from an eBay ad for a similar 1:24 die-cast model:



As Used by President Dwight D. "Ike" Eisenhower

1:24 Scale Diecast Metal Replica

Opening Hood

Opening Doors

Opening Trunk

Workable Steering

2 Flags - USA and Presidential - Mounted on Fenders

Lots Of Detail On Body, Engine & Interior

The 1956 Cadillac presidential parade cars were 21 feet long and weighed 7,000 pounds. The two identical cars were built by Hess & Eisenhardt, beginning with a Series 56-86 commercial chassis characterized by a 158 inch wheelbase and a 365 cid, 305 horsepower V-8 engine. Because they replaced the previous twin presidential Cadillac parade cars known as the Queen Mary and Queen Elizabeth (named after the largest ocean liners of the day), they became known as Queen Mary II and Queen Elizabeth II. Like the cars they replaced, they were arsenals on wheels with features like pistol holders and a rifle rack. There were also phones and a large extra-large siren with an oscillating rear light. The car tires were fitted with a narrow rim inside the tire to support the car should the tires be shot out. The special Cadillac could travel 115 mph if needed. Secret Service agents were given extensive training in driving these huge cars under all possible emergency conditions, including while under bullet fire or with other agents firing weapons from the moving car. This car is still operating today, although retired in 1968, and is owned by a businessman in Cincinnati.

Hope these length and wheelbase data are of some assistance [if you know the wheelbase, you can estimate length/height from that information].

Edited by Mark Knight
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Don, since I haven't seen any follow-up on this topic in over a week, I figured I'd "bump" it closer to the top of the pile in case there's something you can use here.

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